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hannesmystic3

Mercedes A Klasse Hybrid Camshaft Sensor Issue

My Mercedes A Klasse hybrid is acting up Check engine light and rough running at high mileage I'm getting a camshaft sensor defective error, possibly a cable or plug issue Has anyone seen this

Summary of the thread

A Mercedes A Klasse hybrid was experiencing a check engine light and rough running, with a diagnostic error indicating a defective camshaft sensor. The issue was suspected to be related to a cable or plug problem. It was suggested to inspect the wiring harness for damage or corrosion and to wiggle the connector to check for loose connections. The problem was resolved by cleaning corroded connector pins and replacing the connector, which eliminated the rough idling and restored smooth engine performance.

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4 comment(s)

victoriaeis21

That sounds frustrating I had a similar sensor issue with my old Audi, but it was the crankshaft position sensor I had rough idling and occasional stalling Have you checked the wiring harness for damage or corrosion Wiggle the connector while the engine is running carefully to see if it stumbles more That would indicate a loose connection

hannesmystic3 (community.author)

That's a good idea about wiggling the connector What kind of damage should I look for on the wiring harness I'm not an expert Was the crankshaft position sensor issue on your Audi caused by wiring or the sensor itself

victoriaeis21

By damage, I mean frayed wires, cracked insulation, or corrosion on the connector pins Use a magnifying glass In my case, it was a corroded connector pin I cleaned it and applied dielectric grease, which helped temporarily Eventually, I replaced the sensor and connector, as the corrosion returned Given the symptoms and error code, I'd take it to a workshop They can diagnose it properly and ensure the camshaft position is correctly aligned if they replace the sensor Better safe than sorry with a hybrid

hannesmystic3 (community.author)

Thanks for the advice Wiggling the connector didn't help I took it to the workshop, and you were right Corroded connector pins to the camshaft position sensor They cleaned it, and the rough idling and reduced engine power are gone The bill was 95€, including a new connector and labor The check engine light is off, and the car is running smoothly again I appreciate the help

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MERCEDES

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AKLASSE